| 摘要 |
AN OPTICAL DISK AND A METHOD FOR IDENTIFYING THE OPTICAL DISK ARE PROVIDED WHICH MAKE IT POSSIBLE TO IDENTITY A RECORDING SYSTEM OF THE OPTICAL DISK EASILY IN A SHORT TIME BY A RECORDING AND REPRODUCTION APPARATUS WHEN A GROOVE-RECORDING SYSTEM AND A LAND—RECORDING SYSTEM ARE BOTH EMPLOYED IN ONE KIND OF OPTICAL DISK, FOR, EXAMPLE, A BD-R. SPECIFICALLY, THE POLARITY UPON REPRODUCING THE WOBBLE INFORMATION IS MADE TO BE THE SAME IN BOTH OF THE OPTICAL DISK OF GROOVE—RECORDING SYSTEM AND THE OPTICAL DISK OF LAND-RECORDING SYSTEM. THE RECORDING SYSTEM OF THE OPTICAL DISK THAT SHOWS THE SAME WOBBLE POLARITY IRRESPECTIVE OF THE RECORDING SYSTEM CAN BE EASILY DETECTED BY FINDING A TRACKING POLARITY THAT CAN RECOGNIZE THE WOBBLE INFORMATION BY CHANGING TRACKING POLARITY, WHEREBY THE START-UP TIME OF THE RECORDING AND REPRODUCTION APPARATUS CAN BE SHORTENED.
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